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RussFast LR Roofing Underlay
Verified by manufacturer 14 days ago
Low resistance vapour roofing underlay
Application
Roofing underlay for warm and cold roof construction.
Description
RussFast LR Roofing Underlay provides a high level of vapour permeability – helping to avoid the risk of harmful condensation, whilst remaining completely airtight.
Features and benefits:
- Can be used in all UK locations (zones 1–5).
- Excellent nail tear strength.
- Fully watertight and airtight.
- Helps to alleviate condensation risk in the roof space in accordance with BS 5250.
- Easy to cut and lightweight for handling.
- No tapes required.
General information
Color | Grey |
Material | Plastic |
Shape | Rectangle |
Length | 50000 mm |
Width | 1000 mm |
Warranty description | 15 year |
Uniclass | |
CAWS | H64/307 Vapour-permeable underlay H64/22 Vapour-permeable underlay H60/235 Vapour-permeable underlay H21/20 Breather membrane H92/785 Breather membrane H67/24 Vapour-permeable underlay H65/22 Vapour-permeable underlay H61/22 Vapour-permeable underlay H60/22 Vapour-permeable underlay P10/320 Breather membrane H22/130 Breather membrane H67/290 Vapour-permeable underlay H65/235 Vapour-permeable underlay H62/235 Vapour-permeable underlay H61/235 Vapour-permeable underlay |
Specification data - Vapour-permeable sheets
Classification data | |
Standard | To BS EN 13859-1. |
Third-party certification | Fully independently certified by BM Trada. UKCA marked. |
Performance criteria | |
Water vapour properties | ≤0.10 MN·s/g. Manufacturer guidanceWater vapour resistance. |
Tensile properties | MD before artificial ageing: 320 (-20) N/50 mm. MD after artificial ageing: 330 (-20) N/50 mm. CD before artificial ageing: 300 (-30) N/50 mm. CD after artificial ageing: 290 (-20) N/50 mm. Manufacturer guidanceMaximum tensile strength. |
Class (minimum) | W1. Guidance for specification option: Before and after artificial aging. |
Weight (minimum) | 184 (-8) g/m². Manufacturer guidanceWeight. |
Elongation | MD before artificial ageing: 90 (+15)%. MD after artificial ageing: 70 (-25)%. CD before artificial ageing: 90 (+15)%. CD after artificial ageing: 70 (-25)%. |
Tear resistance | MD: 190 (-15) N. CD: 200 (-15) N. Manufacturer guidance(Nail shank). |
Flexibility at low temperature | -40 °C. |
Sustainability data
Country of product manufacture | United Kingdom |
Material | Plastic |
Literature
RussFast LR Underlay